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The occurrence of planktonic larvae D. polymorpha was analysed in six Konin lakes varying as to the degree of heated-water discharge. Larvae occurred for a long time (from March to the end of September) in the plankton. No differences were observed in the abundance of planktonic larvae in stronger and less heated lakes. Despite the high production of larvae in heated lakes, the density of adult D. polymorpha was not greater than in unheated lakes.
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Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.